The parent comment just says it'll perform similar to how past similarly-shaped things performed, without saying what that past performance is. If that implies pessimism, that's not HN's fault.
I think they missed "laudable." My first read I thought it said laughable too—it's an easy misread that set a completely different tone for the rest of the comment.
> Incessant nit picking, negativity and doubt casting is my issue.
That has unfortunately been very common internet culture since 2020. It was there before the pandemic, but post-pandemic internet never recovered its full whimsy and veered headfirst into a depressive state. Probably says something about everyone's general mood.